<template>
    <nav class="navbar navbar-default">
    <div class="container">
      <!-- Brand and toggle get grouped for better mobile display -->
      <div class="navbar-header">
        <button type="button" class="navbar-toggle collapsed" data-toggle="collapse" data-target="#bs-example-navbar-collapse-1" aria-expanded="false">
          <span class="sr-only">Toggle navigation</span>
          <span class="icon-bar"></span>
          <span class="icon-bar"></span>
          <span class="icon-bar"></span>
        </button>
        <router-link class="navbar-brand"  to="/">
          <img width="90px" src="src/assets/img/logo3.png" alt="">
        </router-link>
      </div>
      <!-- Collect the nav links, forms, and other content for toggling -->
      <div class="collapse navbar-collapse" id="bs-example-navbar-collapse-1">
        <!-- <ul class="nav navbar-nav">
            <li class="active"><a href="#">Link <span class="sr-only">(current)</span></a></li>
            <li><a href="#">Link</a></li>
            <li class="dropdown">
              <a href="#" class="dropdown-toggle" data-toggle="dropdown" role="button" aria-haspopup="true" aria-expanded="false">Dropdown <span class="caret"></span></a>
              <ul class="dropdown-menu">
                <li><a href="#">Action</a></li>
                <li><a href="#">Another action</a></li>
                <li><a href="#">Something else here</a></li>
                <li role="separator" class="divider"></li>
                <li><a href="#">Separated link</a></li>
                <li role="separator" class="divider"></li>
                <li><a href="#">One more separated link</a></li>
              </ul>
            </li>
          </ul> -->
        <form class="navbar-form navbar-left">
          <div class="form-group">
            <input type="text" class="form-control" placeholder="Search">
          </div>
        </form>
        <ul class="nav navbar-nav navbar-right">
          <template v-if="user">
          <router-link class="btn btn-default navbar-btn" to="/topics/new">发起话题</router-link>
          <li class="dropdown">
            <a href="#" class="dropdown-toggle" data-toggle="dropdown" role="button" aria-haspopup="true" aria-expanded="false"><img width="20" height="20" src="src/assets/img/avatar-max-img.png" alt=""> <span class="caret"></span></a>
            <ul class="dropdown-menu">
              <li class="dropdown-current-user">
                当前登录用户: {{userData.username}}---{{userData.nickname}}
              </li>
              <li role="separator" class="divider"></li>
              <li><a href="#">个人主页</a></li>
              <li><router-link to="/profile">设置</router-link></li>
              <li><a @click.preven="logoutHandler" href="#">退出</a></li>
            </ul>
          </li>
          </template >
          <template v-else>
          <router-link class="btn btn-primary navbar-btn" to="/login">登录</router-link>
          <router-link class="btn btn-success navbar-btn" to="/register">注册</router-link>
          </template>
        </ul>
      </div>
      <!-- /.navbar-collapse -->
    </div>
    <!-- /.container-fluid -->
  </nav>
</template>
  
<script>
  import axios from 'axios'
  export default {
    props: ['user'],
    data () {
      return {
        
        userData: {}
      }
    },
    created () {
      this.getSessionShowUser()
    },
    methods: {
      async logoutHandler () {
        try {
          await axios.delete('/api/session')
          window.alert('退出登录成功')
          this.$router.push('/login')
        } catch(e) {
          console.dir(e);
        }
      },
      async getSessionShowUser () {
        try {
          const {data: session} = await axios.get('/api/session')
          if (!session) {
            return
          }
          this.userData = session
        } catch(e) {
          // statements
          console.log(e);
        }
      }
    }
  }
</script>


<style>
  
</style>